设置一个必要参数UTL_FILE_DIR=lt;pathgt;,保证oracle用户在该lt;pathgt;下有读写权限,该参数不支持动态修改,所以只能在p
1. LogMiner安装
需要以SYS用户身份执行下面两个脚本:
$Oracle_HOME/rdbms/admin/dbmslm.sql
$ORACLE_HOME/rdbms/admin/dbmslmd.sql
2. LogMiner使用
设置一个必要参数UTL_FILE_DIR=
创建LogMiner的字典文件,执行下面的脚本。(注意 - 符号不能丢)
EXECUTE DBMS_LOGMNR_D.BUILD('dictionary.ora', -
'
OPTIONS => DBMS_LOGMNR_D.STORE_IN_FLAT_FILE);
向LogMiner中添加需要mine的Log文件,执行下面的脚本。
EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -
LOGFILENAME => '/oradata/redo01.log', -
OPTIONS => dbms_logmnr.NEW);
EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -
LOGFILENAME => '/oradata/redo02.log', -
OPTIONS => dbms_logmnr.ADDFILE);
EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -
LOGFILENAME => '/oradata/redo02.log', -
OPTIONS => dbms_logmnr.REMOVEFILE);
Log文件的挖掘
你可以选择的用来过滤日志信息的选项
选项 意义
=========== =========
STARTSCN SCN起始号
ENDSCN SCN结束号
STARTTIME 开始时间
ENDTIME 结束时间
DICTFILENAME 字典文件的名字
用来分析的LogMiner视图
视图名 视图信息
=================== ==================================================
V$LOGMNR_DICTIONARY 正在使用的字典文件
V$LOGMNR_PARAMETERS LogMiner的参数
V$LOGMNR_LOGS 正在分析的日志文件
V$LOGMNR_CONTENTS 分析出来的日志内容
使用过滤的例子:
EXECUTE DBMS_LOGMNR.START_LOGMNR( -
DICTFILENAME => '
STARTSCN => 100, -
ENDSCN => 150);
查看日志信息的例子:
SELECT operation, sql_redo FROM v$logmnr_contents;

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

WebStorm Mac version
Useful JavaScript development tools
